A hip joint simulator study using simplified loading and motion cycles generating physiological wear paths and rates

Abstract In some designs of hip joint simulator the cost of building a highly complex machine has been offset with the requirement for a large number of test stations. The application of the wear results generated by these machines depends on their ability to reproduce physiological wear rates and p...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine Journal of engineering in medicine, 1999-01, Vol.213 (6), p.455-467
Main Authors: Barbour, P S M, Stone, M H, Fisher, J
Format: Article
Language:English
Subjects:
Analysis of Variance
Biological and medical sciences
Biomechanical Phenomena
Chromium Alloys
Hip Prosthesis
Humans
Materials Testing
Medical sciences
Motion
Orthopedic surgery
Polyethylenes
Prosthesis Failure
Stainless Steel
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Zirconium
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Summary:Abstract In some designs of hip joint simulator the cost of building a highly complex machine has been offset with the requirement for a large number of test stations. The application of the wear results generated by these machines depends on their ability to reproduce physiological wear rates and processes. In this study a hip joint simulator has been shown to reproduce physiological wear using only one load vector and two degrees of motion with simplified input cycles. The actual path of points on the femoral head relative to the acetabular cup were calculated and compared for physiological and simplified input cycles. The in vitro wear rates were found to be highly dependent on the shape of these paths and similarities could be drawn between the shape of the physiological paths and the simplified elliptical paths.
ISSN:0954-4119
2041-3033
DOI:10.1243/0954411991535068